1990 - 1992 Corvette ZR-1: Service Bulletin: Engine Noise - Install Bushing
Subject: ENGINE NOISE-INSTALL BUSHING 5.7L V8 (RPO LT5)
Model and Year: 1990-92 CORVETTE WITH 5.7L ENGINE (RPO LT5) AND MANUAL TRANSMISSION
Source: Chevrolet Service Bulletin
Bulletin Number: 92-230-6 - (06/15/1992)
Some owners of 1990-92 Corvette ZR-1 may comment on a squeal noise that resembles a bearing noise. This noise may occur during clutch engagement from a standing stop. This noise can also occur during vehicle coast down with the clutch disengaged (clutch pedal depressed).
This noise is due to the input shaft of the transmission contacting the crankshaft bushing. The noise usually occurs during clutch engagement from a standing stop or vehicle coast down because of the speed difference between the engine and the transmission input shaft.
A revised crankshaft bushing is available to reduce the above condition. The revised bushing has grooves in the hole to reduce surface contact with the transmission input shaft.
Crankshaft Bushing P/N 10125896
Remove and install bushing per Service Manual.
Parts are currently available from GMSPO.
Labor Operation: J1420 Use applicable labor time guide for labor hours.
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